brussell



6, 1935. J. BRUSSELL PINKING APPLIANCE Filed, April 18, 1934 3 Sheets-Sheet l as 1- as v a INVENTOR Aug. 6, 1935'. J. BRUSSELL I 2,010,216

PINKING APPLIANCE Filed April 18, 1934 3 Sheets-Sheet 2 Afig. 6, 1935.

. 1. BRUSSELL PINKING APPLIANCE Filed A ril 18, 1954 3 Sheets-Sheet 3 I INVENTOR ATTORNEY Patented Aug.' 6, 1935 UNITED STATES PATENT OFFICE v rnnmvc sermon Jacob Brussell, Bronx, N. Y. Application April 18, 1934, Serial No. 721,085 9 Claims. (chug-122) This invention relates topinking appliances for wedges. To protect the vertical front edge besewing machines and has for an object the contween the blade faces of the knife I make the struction of a pinking attachment to be used on angle between the blade faces a little greater than and in connection with a sewing machine in order the angle cut from the guide or base plate. To

both to sew and pink material simultaneously. prevent waste from getting into the bobbin and 5 In the pinking attachments used at present stopping it, I construct the under side of the base with sewing machines the knife edges have dulled plate in the form of a curve to fit closely over the quickly necessitating frequent changing of blades bobbin and to prevent an accumulation of waste and causing much loss in 'the running time of from being forced forward into and stopping the the machine. This quick dulling of the knife bobbin. In addition, I construct a waste ejector 1O edges is caused by the rubbing of the vertical on the near end of the bobbin directly under the front edge of the blade against the guide and by pinking knife and cut the plate of the sewing mathe unsteady holding of the blade. Another difchine to permit the waste to fall onto the ejector flculty has been a clogging of the bobbin and the and be forced thereby from the machine. To prosewing machine with the waste material cut off vide a varying increasing pressure on the down 15 by the pinker. The waste material or the cut off stroke anda decreasing pressure on the up stroke pinked pieces accumulate where they are cut and for holding the knife against the guides, I conare not forced away and cannot escape by themstruct the pinking appliance so that the upper selves. Thus they accumulate around the hook part of the knife wedge proceeds downwardly in a 10 shaft and bind it and are also forced forward curved path against a downwardly forwardly 2 into and bind the bobbin and stop the machine sloping buffer pad held by a coiled spring. until the hook shaft and bobbin are cleaned out. Further and more specific objects, features and Another difficulty has been the inability to proadvantages will more clearly appear from the devide a varying pressure on the knife edge which tailed description given below taken in connecwill insure proper cutting and a minimum of tionwith the accompanying sheets of drawings strain on the sewing machine. which form a part of this specification.

The object of my invention is to construct a Referring to the drawings, Fig. l is an elevasimple compact strong pinking appliance for a tion of a sewing machine with my pinking apsewing machine. An object isto construct a mapliance attached, the base part of the machine chine so that the knife blade is both set at a partly broken away; Fig. 2 is an elevation of my 30 proper angle and guarded in order to prevent pinking appliance with a modified spring attachundue wear on its cutting edges. At the same ment showing the knife in its most downward time I intend to so construct my knife that it is extended position; Fig. 3 is an enlarged detail supplied with numerous cutting edges each of section along the line 3-4 of Fig. 1 showing the which can be placed in the cutting position by a ejector attachment for the appliance; Fig. 4 is 35 slight movement not appreciably reducing the a vertical section along the line 4-4 of Fig. 1;- operating time of the machine. Fig. 5 is a plan view of my invention showing Another object of my invention is to construct part of a sewing machine in phantom; Fig. 6 is a varying resilient pressure means for holding a plan view of the base plate of my appliance; the knife wedge against its guide with an in- Fig. '7 is a detail showing the knife of my applicreasing pressure on the downward stroke and a ance; and Fig. 8 is an enlarged detail of the spring decreasing pressure on the up stroke. modification.

A further object of my invention is to construct In the drawings, the sewing machine I is conthe under part of the plate or front part of my structed in the usual manner with a base plate 2 pinking appliance of such a shape and so posihaving the upright 3 at the right hand carrying tion this plate that there is little chance of any the horizontal arm 4 which encloses the shaft 5 waste cuttings being forced forward into the boband holds the needle part 6. The base part of. the bin of the machine and stopping it. In addition, sewing machine is constructed in the usual man- I intend to construct as part of the pinking apner and has a feed surface I and a hook shaft 8 60 pliance a waste ejector to force all the cuttings with ahook 9 for holding the bobbin which is not 5 away from the bobbin and the hook shaft and the shown. vicinity of all other moving parts of the machine. Attached to the base plate 2 of the sewing ma- In order to accomplish these objects I conchineand geared to its shaft 5 and synchronized struct on the sewing machine a pinking appllwith its needle is my pinking appliance Hi to cut ance having a reversible knife with four cutting off excess material and form a pinked edge at the same time as the machine sews the goods. My pinking appliance rests on the base plate of the sewing machine near the needle and between the needle and the arm 3. Thereciprocating motion necessary to operate the knife part II of the appliance is received through an arm eccentric and gear connection |2 with the shaft of the sewing machine. An ejecting part I3 for removing the cut waste material is attached to the hook 9 and rotates with it forcing the waste away from the hook shaft and bobbin.

A base part H of my appliance rests on and is held to the base plate of the sewing machine by the washer l5 and screw l6. The base part is provided with an adjusting slot to receive the screw I6 so that the appliance can be properly positioned on the base plate of the sewing machine. To position the appliance in relation to the sewing machine the screw 5 is loosened, the base part is shifted and the screw is then tightened.

The end of. the base part l4 near the needle is cut out forming the legs l1 and the cut out open part l8. At the ends of the legs I1 is a plate I9 secured to the base part by the bolts 28 which pass through both the legs l1 and parts of the plate extending under the legs. The plate I9 is cut out in the form of an angle with the apex toward the needle of the machine and near the feed surface I and the sides 2| flaring sidewise toward the legs |1, so that the cut out part of the plate attains the same width as the open part between the legs. The plate near its wide cut out part is provided with lugs 22 which butt and extend above the ends of the legs H.

The inner sides 23 of these lugs adjacent 'the sides 2| are cut flaring in the same manner and form smooth sides which are a continuation of the sides 2|. The lug sides 23 act as guides for the reciprocating knife part II while the plate l9 and sides 2| act as a shear plate against which the knife part I cuts, the knife part reciprocating in its guides in and out of the shear plate and V pinks the material as it passes overthe plate.

The knife part II is comprised of a knife block 24 and the holder 25. The block 24 has a center part and two vertical wedge parts one on either.

' which slope downward from the center part of the block toward the edges 28. In this way the upper part of the knife block is constructed similar and opposite to the lower part so that the block can be reversed and the upper part used as the lower cutting part. In addition the block may be re versed again, the back wedge being similar to the front wedge. By these reversals four different sets of cutting edges are obtained, the two faces 3| and the two faces 32 may each in turn be placed in the lower front position at which position cutting takes place.

In order for the holder 25 to grasp the block firmly both sides and the top and bottom center partof the block are cut out forming the slot 33 which extends completely around thecenter part of the block. The holder is constructed with legs 34 which extend into the slot 33 and are atta h d to the block by the pin 35 which passes through the center of the block and the ends of the legs. The position of the pin 35 at the center of the block permits the block to be turned around and inverted in the holder and so allows all the various wedge faces to be placed in the cutting position.

The edges formed by the intersection of the faces 26 and 21 with the faces 3| and 32 are the cutting edges and cut or shear in conjunction with the top and sides 2| of the plate. The angle between the intersecting faces 26 and 21 is slightly greater than the angle between the out out sides 2| of the plate and lugs 23 so that the wedge is held a little back from being an exact fit in the cut out part and the edge 28 is held a little away from the intersection of the cut out sides 2|. In this way the edge 28 retains its sharpness being prevented from wearing and the lugs 23 act as guides and hold the wedge in its proper position.

The faces 26,21, 3| and 32 are lubricated by a system of grooves and holes. There is a groove 36 in each of the faces 26 and 21 and holes 31 extend in the grooves through the block from the face 26 to the face 21. The holes 31 are intersected by holes 38 extending from the faces 32 through the block to the faces 3|. In this way all' the faces of the block are lubricated by the simple application of lubricant to each of the holes 38 and the sides 2| of the plate receive lubrication by contact with the lubricated faces.

The transfer of the rotary movement of the shaft 5 of the sewing machine to the reciprocating motion of the knife block is accomplished by means of the gear 39 on the shaft 5 meshing with the gear 40 on the shaft 4|. The ratio of the gear 39 to the gear 48 is two to one which causes the needle of the sewing machine and the knife of the appliance to sew and cut the. material at the same rateof speed. The shaft 4| turns in the bearings 42 which also form a housing for the shaft and gears and in addition act as a grease or oil pocket and contain lubricant for the gears. The bearings have side parts 43 which extend upward part way around the arm 4 and are held to the arm 4 by the screws 44.

The rotary motion of the shaft 4| is transferred by an eccentric 45 at the end of the shaft 4| to a reciprocating motion in'the arm 46. The length of the arm 46 is adjustable being in two lapping parts and held together by the thumb screw 48. The length of the arm is adjusted to correspond to the various positions of thebase plate which can be moved relative to the position of the needle in order to vary the width of the pinked margin left after cutting.

The arm 46 is pivotally held at 46a to the arm 41 intermediate the ends. One of the ends of the arm 41 is pivotally connected at 41a to the part of the base plate i4 removed from the'cut out portion, and the other end of the arm forms a pin joint 49 with the upper part of the knife holder. Thus the reciprocating motion of the arm 46 is transferred through the arm 41 to an up and down motion in the knife part. As the lower end of the knife is held against the guides at all times block and pad 50a of the spring provides the contact against either face or 21 so as not to inlure the edge 28. The lower part of the front face 5| of the pad a slopes downward and for ward toward the knife wedge so that as the wedge descends against the face 5| an increasing pressure is exerted by the spring and as the knife wedge rises out of the lower part of the face the pressure is decreased. A screw 52 extends through the arm 21 and the spring 50 and holds the spring in compression. The spring-is bent bow shaped so that tighteningthe screw increases the tension in the spring and pushes the knife block forward against the guides or sides 2| of the plate. As the knife descends the spring causes an increasing pressure due to the horizontal component of the travel toward the right of the upper part of the knife block and as the knife block is raised the opposite movement with a cormsib nding decreasing pressure takes place. The increasing pressure on the down stroke tends to insure even clean cutting while thedecreasing and weakened pressure on the up stroke reduces the strain on the sewing machine. The best results occur when the strongest pressure of the spring coincides with the position of the eccentric furthest from dead center. A modification is shown in Fig. 2 which has the coiled spring 52 in place of the flat spring 50. The rear of the pad 50a in this case is connected to the arm 53 which has a narrowed part 54 over which the coiled spring 52' extends. A recess 55 is provided in the plate ll into which the arm 53 extends and against the end of which one end of the coiled spring rests. A screw 55 extends throughthe plate 14 into a slot 51 in the arm 53 and guides the movement of the spring, arm and pad.

In order to dispose of the cut waste material the base plate 2 of the sewing machine is provided with the cut out part 58 which corresponds to but is bigger than the cut out part I! of the appliance and permits the lower part of the plate 1! to rest in the cut out part 58 and the base plate ii to rest on the base plate 2 of the machine. The waste falls through the cut out parts ll and 58 and is removed by the ejector 55 which pushes the waste-outward .and downward from the machine parts and prevents the clogging of the space around the hook shaft and from getting in between the end part of the base part of the appliance and the hook 9. The ejector 55 which is placed on the rear part of the hook directly below the cut outparts 58 and I8 snaps over the rear end of the hook and extends sidewise and then forward as at 60 toward the hook. The ejector may be screwed or joined to the hook in any other suitable manner and may be of a different shape from the one illustrated and described. The rotating movement of the hook shaft is imparted to the ejector and causes the ejector to push the cut out material sidewise and downward so that it falls away from the hook shaft and other moving parts.

In order to prevent any of the waste material from accumulating between the hook and the under part of the base part it the under part of the part It is cut out in an arcuate form 5| similar to the shape of the hook thus reducing the space between the base plate ll and the hook and allowing little possibility of waste entering and clogging the hook and bobbin of the machine.

Hence I desire to cover all modifications, forms and embodiments coming within the language or scope of any one or more of the appended claims.

I claim:

l. A pinking appliance for a sewing machine having a knife, 9. means for transferring the rotary movement of the shaft of the sewing machine into a reciprocal movement of the knife, a base plate, sides in said base plate forming an opening therein and co-acting with said knife for cutting, and ejector means on the hook shaft of the sewing machine beneath said opening.

2. A pinking appliance for a sewing machine having a knife, a means for transferring the rotary movement of the shaft of the sewing machine into a reciprocal movement of the knife, a base plate, said base plate having a curved under part corresponding to the curve of the hook and permitting the close approach of the upper partof the hook to the under part of the plate, inner sides in said base plate forming an opening therein and co-acting with said knife for shearing, and ejector means on the hook shaft of the sewing machine beneath the opening.

" 3. A knife for use in a pinking appliancefor a sewing machine having a mid portion, two side faces extending from the mid portion converging to an edge, a bottom face sloping upwardly outwardly intersecting the two side faces to form a cutting wedge, a top face sloping downwardly outwardly intersecting the two side faces to form a second cutting wedge, a second set of side faces extending from the mid portion opposite and similar to said first mentioned set of side faces and top and bottom faces corresponding to and opposite to said first mentioned top and bottom faces intersecting said second set of side faces to form a third and fourth cutting wedge.

4. A knife for use in a pinking appliance for a sewing machine having a mid portion, two side faces extending from the mid portion converging to an edge, a bottom face intersecting the two side faces to form a set of cutting edges, a top face intersecting the two side faces to form a sec ond set of cutting edges, a second set of sidecular motion of the sewing machine shaft to a reciprocal motion in the knife, a guide against which the knife shears, a spring forcing the knife against the guide and a buffer contact piece for said spring having a forwardly downwardly sloping face over which the knife travels giving an increasing pressure to the knife on its downward stroke and a decreasing pressure to the knife on its upward stroke against the knife guide.

6. A pinking -appliance for a sewing machine having a knife, a means for transferring the rotary movement of the shaft of a sewing machine into a reciprocal movement of the knife,

a base plate, sides-in said base plate forming an opening therein and co-acting with said knife for cutting, a spring means between said base plate and knife and co-acting with said knife to force said knife forward, and guide means co-acting with said spring means for positioning said knife.

7. A knife for use in-a pinking appliance for a sewing machine having a grooved mid portion, said mid portion having a hole through its center, two side faces extending from the mid portion converging to an edge, a bottom face sloping upwardly outwardly intersecting the two side faces to form a cutting wedge, a top face sloping downwardly outwardly intersecting the two side faces to form a second cutting wedge, a second set of side faces extending from the mid portion opposite and similar to said first mentioned set of side faces and top and bottom faces corresponding to and opposite to said first mentioned top and bottom faces, intersecting said second set of side faces to form a third and fourth cutting wedge, a forked holding element extending into said grooved mid portion and having openings corresponding to the hole in the mid portion and 9, pin fitting into the hole and openings in said forked element and mid portion.

8. A pinking appliance for a sewing machine having a knife, a means for transferring the rotary movement of the shaft of the sewing machine into a reciprocal movement of the knife, a base plate, sides in said base plate forming an opening therein and co-acting with said knife for cutting, and a wire bent into an arcuate form with projecting ends mounted on the hook shaft of the sewing machine beneath said opening for ejecting the waste material.

9. A pinking appliance for a sewing machine having a knife, a means for transferring the rotary movement of the shaft of the sewing machine into a reciprocal movement of the knife, a base plate, said base plate having a curved under part corresponding-to the curve of the hook of the sewing machine and permitting the close approach of the upper part of the hook to the under part of go the plate.

JACOB BRUSSELL. 

